Whistle



FIG. 1 is a front, top, and right sides perspective view of a whistle, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a cross-sectional view taken along line 8-8 shown in FIG. 2;

FIG. 9 is an exploded view thereof; and,

FIG. 10 is a reference view showing the whistle in use.

The evenly spaced broken lines shown in FIG. 10 depict environment and form no part of the claimed design. 

CLAIM The ornamental design for a whistle, as shown and described. 